Core-cleaning tool



May 29, 1928.

H. L. NASH CORE CLEANING TOOL Filed Jan. 23, 1926 m M a 0 M 1 3 Patented May 29, 1928.

UNITED STATES PATENT OFFICE.

HABOLD L. NASH, OF SOUTH NOR'WALK, CONNECTICUT.

, Conn-CLE NING r0011.

Appli ation filed January'23, 1926. Serial No. 83,311.

This invention relates to percussion tools of the hammer or drill type, more particu-' larly to those used ascore cleaning tools, for removing the cores from castings, and con sists in an improved construction whereby the exhaust from the motor, or fluid under pressure from some other source, is em loyed to remove the sand as it is loosened y the hammer point or drill.

Two embodiments of the invention are illustrated in the accompanying drawing in ing a modificationthereof.

which:

Figure 1 is a vertical sectionof a pneumatic core cleaning tool;

Figure 2 is a partial'vertical section show- In Figure 1 the compressed air operated piston 1 is reciprocated in cylinder 2 by air admitted through inlet 3 controlled by valve 5, which is depressed to'open position by valve lever 6, pivotedin thehandle 7. The valve is raised to shut ofi the air by spring 8 when the lever is released. Theex haust passage 9- from thencylinder, which contains valve mechanism 10, not shown in detail but of any ordinary construction, leads into the hollow hammer rod 11 through openings 12 in the same. 13 is a leather dust shield covering the front end of the cylinder through which the rod 11 reciprocates. At its lower end, rod 11 carries the hammer head 14. The passage in therod 11 leads into the passage 15 in said head, said latter passage being curved upwardly and terminating in a restricted nozzle 16, enclosed in an enlarged annular chamber 17, the nozzle and chamber constituting an ejector of the well known type. Chamber 17 has an enclosed upwardly directed neck 18, to which is attached an exhaust hose 19, secured to rod 11 by a clamp 20 to keep it out of the way. This hose 19 has the function of leading the air and sand exhaust to any desired place.

The hammer head point 21 is provided with lateral openings 22 closely adjacent the tip through which the loosened sand is drawn into passage 23, leading to the chamber 17 of the ejector.

The operation will be readily understood from the above. The exhaust air, flowing through the rod 11, passage 15 and nozzle 16, creates a reduction in pressure in passage 23, drawing in the sand, loosened by the hammer point 21, through openings 22 and passage 23, and carryin it away through chamber 17 and'thence by a conveying action through hose 19. i i

It is obvious thatother motive fluid than air could be used and that my improvement is applicable to tools of this kind provided with any type of motor. It the motor is electric, for example, the hollow hammer rod is connected to an external source of fluid under pressure.

Figure2 discloses the intermediate section of'a core cleaning tool of the above men tioned type in which it is assumed that motive power other than compressed air is used in the operation thereof. No motor has been illustrated for it forms no part of the invention. The lower portion of the hammer stem 11 is hollowas in the previouslydescribed modification but the upper portion where joined to the hammer is solid as shown at 25. An air intake 26 is provided, connected by means of hose 27 to any suitable source of fluid supply under pressure. The pas sages28 and 29in the upper and lower portions of the hammer stem 11 respectively are bent at right angles and project into the boss 30 which may be formed integral with the stem and are adapted to be connected together or isolated from each other by means of a valve mechanism 31 which can be actuated by the handle 32 to either permit air to flow thru the stem and to the ham mer head 14 which is identical with that shown in Figure 1 or to cut off the supply when desired. This modification functions in exactly the same manner as the modification disclosed in Figure 1 and the exhaust air and sand are carried off thru the hose 19 as in that modification.

It has been foundthat oftentimes considerable advantage may be gained by blowing the sand or chips loosened by the cutting tool rather than by attempting to exhaust them thru the hose 19. For this purpose the tool may be provided with a valve 33 between the exhaust passage in the neck 18 and the exhaust hose 19, so that upon the turning of the handle 34: thru an angle of substantially 90, the exhaust passage may be cut ofi from the hose 19 and the air passing thru the passage 15, either from the motor in the type of tool as shown in Figure 1 or from an external source in the type of tool as shown in Figure 2, may be directed out- Wardly thru the openings 22. The valve 33 Ion is here shown as of the tapered plug type such as is in common use for many purposes and need not be described in detail here, being sufiicient to say that in one position of the handle a passageway is opened between 18 and 19 and in the other osit ion such passageway is closed. The air owin outward thru the passages 22 is direote along the cutting tip 21 of the tool and is effective in bl wing away port ons which are loo ened by his on Wh n, it s sired to reverse the process anddraw away the. loosened par cle he valve urn touopen a pa sa 8 be ween nd 19 Having thus. J s ribed the i v ntion what la me as ne and de ir s oi e se ure by Letters Pa e is: i

In a fluid ope ate p rcussion t ol, th combination with the motor, of; a hollow hammer rod adapte to ecei e h exhau fia fi m a d mo or, a hammer head c reed by wired, an n up ard dweoted e ector ieaid head, and m to mg con: mat d. t the amme Point and the lat e a ing openings through wh sh. th mat rial oosened by he hammer s suck d by sa de' tor.

2 n amo o oper t d. perc sslon ool, a hammer hea con aining an. upward y di rested: .ejeoton nozzle and provided [with openings near its point, a hollow rod cartying said head and operated by the motor, and means .whereby'fluid under pressure is awiitted through said rod to. said nozzle, whenehy the cuttings QSned by said tool re d aw t roug aid pe n y the ct on i o 3. In a tool of the class described, a hammer head, an ejector nozzle in said head, an outlet leading upwardly fi'om said nozzle, head having sand inlet openings near its point and a passage leading from the latter to said outlet, and means to supply fluid under pressure to said nozzle.

f1- n a fluid, ope at d. Per us on o the ombine iee i he m to o a, hollow hamme rod a ap ed t e eiv the. exha s firom said motor, a hammer head carrjed by said rod, and an upwardl directed jecta in said head a j cto ing o nested, ts th p nt and t a t r hav z g a hr u h w ch t e rial oosened by the hammer is sucked .b a a d eiwmmed mess to a w l, c s th amus s and wa f r th -pu po e descrl .5, n c re elwiea'mh a h mme ha provided with passages wtituting an ejeconsw h, w ie a tw ear 1 8. P i a hollow reciprocatory ro oa x ning' said head and somewha wath (pas a me n to man y a P e s e in l l r d. Qarn deby sa d od o c ry o t e uid n sand ite an h a and m ans to clos -9 1m aw yns fi m ns wh re y th flmdinayeb ewn o t o sa inlet ports- In t stimony her i I" llareuato,.aflis my signatuae.

LHA QLD L- NASH- 

